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A mobile ad hoc network is much more assailable to attacks than a wired network due to its limited physical security, high mobility and lack of centralized administration. Jellyfish is a new denial of service attack. There are three kinds of JellyFish attacks i.e. JF Reorder Attack, JF Periodic Dropping Attack, JF Delay Variance Attack. In JF delay variance attack, intruder node needs to intrude into forwarding group and then it delays data packets for some amount of time before forwarding. Due to JF delay variance attack, high end- to- end delay takes place in the network and performance of the network (i.e. throughput etc) becomes worse. In our paper we have done a comparative performance analysis of three reactive routing protocols i.e. AODV, DSR and TORA used in mobile ad hoc network under JF delay variance attack with increasing node density. If we have a mobile ad hoc network in which probability of occurrence of JF attack is high and also if it requires time efficient network service for information exchange with increasing number of nodes then we have to choose DSR protocol. If it requires high throughput and consistent service in the network with increasing node density then TORA protocol is recommended.